About invoker ( dota 2 )

There's a hero who has always been a fan of me, his name is Invoker.I can say that at first I found it hard to play with him, everyday I practiced until I learned his 10 spells, so I can combine them and get some successful combinations to put the opponents' in difficulty.
Here is one picture with his spells.

Currently this hero is most played by professional players, in my turn I have accumulated about 600 games with the invoker.
Each hero must use items that you can buy during the game, making gold from creeps, those creatures are small monsters that you have to kill to get gold.
The basics that I use are:
-boots of travel
-hand of midas
-force staff
-aghanim's scepter
-black king bar
-refresher orb (optional)
Here are some pictures of the items I used.

Each hero differs between the set of items and the game mode, each player can create his or her own guide for buying the items, or take it from other experienced players or simply use the ones recommended by the valves.
With the invoker you can play just in the middle, there are two more lines called top and bottom.The mid is 1 vs. 1, and the other 2 lines play 2 vs 2 or even 3 vs 2, depending on the match.

If your hero in the game wants to look in a certain way, to stand out, you can buy some sets of it, worth from 0.50 (about), which can reach up to 200 euros or maybe even more, depending on each hero, and the intuition of the creators of the game.
At the invoker, for example, the most expensive set is 200 Euro called Dark Artistry, as you can deduce from his name refers to a set of darkness, changing the hero's 2 skills, without damaging it in addition, changing it only appearance.
You have a picture below with the 200 euro set.

So I had to say about this hero, I'll come back with some more detailed blogs about heroes and the game.
Thank you for your attention, if you liked, do not forget to leave a comment for encouragement.